An expression for the frequency chirp to modulated power ratio (CPR) is derived from a rate equation analysis of the small-signal, injection current modulation in a semiconductor diode laser. The model includes the effect of lateral carrier diffusion across the active region of the laser diode. The modulation frequency dependence of the CPR is flat from dc to a few hundred megahertz, beyond which ...
View full abstract»

A simple, closed-form expression is derived for the far-field patterns corresponding to the modes of a phase-locked array of identical elements. That allows a comparison between the correct array-mode far-field patterns (i.e., coupled-mode theory) and the heuristic, diffraction-grating-like far-field patterns generated by using simple diffraction theory. The ...
View full abstract»

A high-pressure ( atm) electroionization laser operating on the xenon atomic transitions is investigated for a pumping pulse duration range up to 30 μs. An output energy of more than 60 J has been achieved with an Ar-Xe mixture and an active volume of 10 1. The angular divergence of the radiation was a...
View full abstract»

The evolution of the pulse in an AM mode-locked TEA CO2laser has been investigated. The experiments have been performed by injecting the mode-locked pulses in a high-pressure slave oscillator at various time intervals after the initiation of the mode-lock process. This technique allows the measurements of the pulse widths independent on the pulse energies. A numerical solution of a dyna...
View full abstract»

We have investigated the effect of amplified spontaneous emission (ASE) on the spectral and temporal characteristics of narrow-band pulsed dye laser oscillators. The space and time dependent rate equations for the molecular populations and photon fluxes have been solved numerically to study the dependence of ASE on various laser parameters and the effects of ASE on the spectral and temporal profil...
View full abstract»

The design and performance of an Nd+3:YAG pumped, short cavity dye laser-dye amplifier system is reported. This system produces narrow bandwidth, broadly tunable picosecond pulses with energies in the millijoule range.
View full abstract»

The coupling characteristics of intersecting diffused channel waveguides are computed for realistic three-dimensional diffusion profiles by means of the propagating beam method (PBM). Both TE and TM polarizations are treated for waveguides formed on -cut LiNbO3. Good agreement between computed and previously reported measured results is found for t...
View full abstract»

A capacitively coupled RF-excited CW-HCN submillimeter wave laser has been investigated to obtain about 260 mW in continuous wave at 337 μm using a laser tube of about 1 m in length and 55 mm in diameter.
View full abstract»

We have measured the frequency response of InP/ InGaAsP/InGaAs photodiodes with separate absorption, "grading," and multiplication regions (SAGM-APD's) for a wide range ( ) of dc gains. The results are explained in terms of a theoretical model which incorporates the transit time of carriers through the depletion region, the RC time consta...
View full abstract»

The use of N2O and CO2isotopes as active species for a blackbody radiation pumped laser has been experimentally demonstrated and theoretically analyzed. The results obtained for mixtures containing N2O,13C16O2, and12C18O2are presented. For the first time, continuous lasing action with blackbody radia...
View full abstract»

The FM and AM noise spectra of 1.3 μm InGaAsP DFB lasers are measured in the frequency range from dc to 4 GHz. The relaxation resonances appearing in these spectra are compared to the semiclassical theory of laser noise. All the resonance parameters, i.e., the linewidth enhancement factor α, the resonance frequency fR, and the damping constant γe, are determine...
View full abstract»

A novel transverse-discharge copper-vapor laser has been developed using a flat-plate Blumlein pulse-forming circuit. This copper-vapor laser system generates a current pulse with a fast rise time (<10 ns) and laser-specific energy density of 22 μJ/cm3even under a highly contaminated condition. An 8 ns long laser pulse is generated in an approximately ...
View full abstract»

The phase-locking of two coupled lasers is studied using the model of Spencer and Lamb. Tuning curves for the odd and even normal modes of two coupled empty resonators are presented to show the origin of the strong frequency-pulling of the coupled lasers. It is shown that the even mode is preferable for combining the two laser beams in the far field. Scaling relations, obtained for the locking ran...
View full abstract»

Sealed-off operation of a compact, corona-preionized, TEA CO2laser capable of efficient laser action at pulse repetition frequencies of up to 1 kHz is reported. By adding hydrogen to the basic gas mixture we have been able to maintain discharge stability and constant average output power for more than 20 million laser shots at a 400 Hz repetition frequency with peak powers in excess of ...
View full abstract»

This paper presents a theory describing coupled optical resonant cavities by means of systems of time-dependent coupled equations for the field amplitudes of standing waves in each resonator. The coupling coefficients entering the theory are derived from first principles. To the author's knowledge, this theory is new. The coupling coefficients can approximately be related to the amplitude transmis...
View full abstract»

Comparisons are made of the phase and amplitude fluctuations of a laser when it operates single mode and when it is mode locked with the same total average power. Despite the much lower signal-to- (spontaneous emission) noise ratio of the mode-locked laser, the linewidth of each of the locked modes is the same as that of the single mode. The fluctuation of the total intensity of the mode-locked la...
View full abstract»

Energy extraction measurements are obtained with a 350 ns electron-beam pumped KrF laser (Ar diluent) at Kr concentrations from 4-99.6 percent. During the measurements, the F2number density is held constant at cm-3, and the average pump rate is maintained at ≈120 kW/cm3by adjusting the total pressure o...
View full abstract»

Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics..